Boring-machine.



(No Model.)

II II III!" II" II" II 0. c. .McCLELLAN.

BDBING MACHINE.

. (Application 0100 June 2, 1900.)

Patented Mar. l9, |90L mm Q 0 Inm UNITED STATES PATENT OFFICE,

GEORGE MCOLELLAN, MENA, ARKANSAS.

BORING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 670,003, dated March 19, 1901. Application filed June 2, 1900. Serial No- 18,884. (No model.)

To all whom, z' t may concern.-

Be it known that I,-GEORGE C. MOCLELLAN, a citizen of the United States, residing at Mena', in the county. of Polk and State of Arkansas, have invented a new and useful Boring-Machine, of which the following isa specimeans by which the'inechanism can be withdrawn from the been made.

frame after the mortise has 1- With these objects in view my invention consists in the improved construction and novel "arrangement of parts of a mortisingmachine, as will be hereinafter more fully set forth. a

- In the accompanying drawings,- in which the same reference-numerals indicate corresponding parts in each of the views in which,

they occur, Figure 1 is a perspective view of my improved, mortising-machine. Fig. 2 is a front view of the same. Fig. 3 is a sectional A view near the top looking downward; and

Fig. 4 is a bottom plan iew, the, adjusting mechanism being shown in two posi ions. 'f

Referring more particularly to t e drawings, '1 indicates the base of my machine,

which is preferably formed from wood and may be of any convenient size and shape. The forward end is provided with a central slot or recess 2, from each side of which rises a Vertical standard 3, preferably circular in cross-section. A cross-piece 4 is secured to the upper ends of said standards and is provided with a suitable catch 5. A frame 6 is arranged to slide vertically upon said standards by means of perforated brackets or ears 7, which fit loosely upon the standards. The upper end of the frame is preferably formed substantially circular or bow-shaped and is adapted to engage with the catch and be held inits raised position. Two oross-heads 8- are secured to the bottom and intermediate crosspieces 9, respectively, on the frame, and are joined at their ends by vertical rods or braces 10. J ournaled in the cross-pieces is aseries of rotary shafts 11, five being shown in the 14 on the shaft 15, which is journaled transversely at the upper'end of the frame. The

drawings, the upper ends of which are proouter ends of the shaft are provided with the usual crank-arms 16 for rotating it, and also with a pinion 17, which is adapted to engagewith a rack 18 for raising the frame after the mortise has been formed. The rack 18 is preferably swiveled to one of the standards by means of collars 19, thefupper one of which rests upon a shoulder 20, formed upon the, standard, and prevents the rack being moved downward, but permits of its being freely swung around upon the standard.

The lower end of each of the shafts 11 is provided with any suitable chuck 21, within which is secured the stem or shank of 21-bit 22-as, for instance, by means of a set-screw Although the bits may be of any desired construction I have good results by using double-lipped screw-center bits. Owing to the reverse motion communicated to said shafts by the interm'eshing gear wheels a portion of said bits must be left-handed, as they will run in a reverse direction to the ot ers. The end hits are shorterthan the, entral ones, so that they will pass 'part way t rough the frame when the central bits have passed entirely through, thereby forming a seat at each end of the mortise for the reception'of lips or projections upon the wheel-casing to be secured therein. A suitable collar 24 is adj ustably secured upon the lower end of one of the standards-as, for instance, by means of a set-screw25, against which the lower end of the bit-frame will engage and preventits farther downward passage.

For the purpose of adjusting the machine laterally upon the frame to be mortised I provide the base with two rods or bars 26, which project froin the bottom thereof in position to engage with the side of the frame beingoperated upon and. hold A the; machine injthe proper position to cut themortise. Thebars are pivotally secured at their ends to the outer ends of two sets of swinging arms 27, the inner ends of said arms being pivotally secured near the center of the'base. Pivotally connected with the forward arms intermediate their ends are two links 28, which are adapted to fit within suitable recesses 29, formed in the bottom of the base. The forward end of each link is provided with a screw-threaded boss or projection 30, into which fits an adjusting screw 31. screw fit within a vertical slot 32 through the base, and the adjusting-screw is provided with a shoulder 33, which engages with a plate 34 on top of the base and clamps the lower end of the link, which is preferably expanded, as shown at 35, against the bottom of the base and holds the swinging arms and the adjusting-rods rigidly in position.

.In using my improved mortising-machine the rods upon the bottom are adjusted so that when the base is placed upon the frame the rods will pass down upon the sides thereof and hold the base against lateral movement. The bit-frame is then released from the catch at the top, when its own weight will carry it down until the bits through the slot in the forward end of the base and engage with the frame to be mortised. The shaft at the top of the frame is then rotated, which will impart motion to the bits. As soon as the bits have entered the wood the desired distance the lower end of the frame will engage with the adj Listing-collar and pre'ventthe furthordescentot' the f rame'. The operator then swings the rack around until it engages with the pinion, when the frame can be readily withdrawn to its original position by simply rotating the shaft with one hand.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a mortising-machine, the combination, with'a base provided with a slot at one end, of standards rising from the base upon opposite sides of said slot, a cross-piece at the upper ends of said standards provided with a catch, a frame mounted upon said standards, the top of which is curved and adapted to engage with the catch, cross-heads secured to the cross-pieces of the frame, rods for securing the ends of said cross-heads together, shafts journaled in said cross-heads, the upper ends of which are provided with inter- The projection and 2. In a mortising-machine, the combination, with a base, one end of which is slotted, of two cylindrical standards rising from said base upon opposite sides of the slot, the upper end of one of which is provided with a shoulder, a cross-piece atihe upper end thereof provided with a catch, a frame, the sides of which are provided with sleeves that fit loosely upon said standards, shafts journaled in the frame, the upper ends of which are provided with intermeshing gear-wheels and the lower ends with chucks,a sh aft journaled in the upper portion. of the frame provided with means for operating said shafts, a gearwheel upon said crank-shaft adjacent to one side of the frame, a rack adjacent to said gear-wheel, the ends of which are provided with collarswhich fit loosely upon the standards, the upper collar resting upon the sh oulder of said standards, and a collar adjustably secured to the other standard below the frame, substantially as described.

In a \mortisiug machine, the combination, with a base, one end of which is slotted, of standards risingfrom the baseupon oppositesides of the slot, a bit-frame upon said standards provided with means for operating the same, swinging arms pivot-ally secured to the under side of the base, bars pivotally secured to the outer ends of said arms, and means for securing said arms and bars in their adjusted positions, substantially as described. v

I. In a mortisingmachine,'the combination, with a base, one end of which is slotted longitudinally, of a bit-frame arranged above the slotted end of thebase and provided with means for operating the same, two pairs of swinging armspivot-ally secured tothe under side of said base, a bar pivotally secured to the outer end of each pair of arms, a link connected with one arm of each pair int'ermediat-e its ends, and a clamping-screw extending through the base and engaging with each link, substantially as described.

5. In a mortisingmachine, the combination, with a base, one end of which is slotted and provided with plates, of a bit frame above said-slotted end of the base and provided with means for operating the same, two pairs of swinging arms pivotally secured to the under side of the base, a bar pivotally secured to the outer end of each pair of arms, a link pivotally secured to the intermediate portion of one arm of each pair, the opposite end of which is expanded and provided with a sorew-threz uled boss, and a shouldered screw extending through each slot, the lower end. of

. which engages with the boss and the shoulder engages with the plate and is adapted to forcethe expanded portion of the link into engagement with the base and lock the bars in their adjusted posi tions,substantiall y as described.-

GEORGE O. MOCLELLAN. Witnesses:

M. A. NELSON, C. R. VAN NADA.

Ibo 

